How long have parts to be available for cars?.I have a six year old car that needs a certain part.this has been confirmed by main dealer.In order for them to repair the car, they must also replace other bits ,to enable the comparable parts to work.So in other words,I am expected to pay to replace parts which are not defective to allow them to repair the car.What is the legal position on this if anyone knows?The cost of the non defective parts is approx €400.Total costs approx €1700.Thanks for any help.